I heard about this on the radio on the way to work this morning. Too much pain from back injury/surgeries is the reason he gives for not touring any more. They did say on the radio that Ozzy would still perform some, just not on the road.
Glad I got to see him a few years ago here in Syracuse. 7th row, center. He's a funny S.O.B. on stage sometimes. He broke out a fire hose and doused the first few rows with it, harmlessly of course. Twice.
Rock on Oz!